• Title/Summary/Keyword: Free viewpoint video

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Implementation Method for DASH-based Free-viewpoint Video Streaming System (DASH 기반 자유시점 비디오 스트리밍 시스템 구현)

  • Seo, Minjae;Paik, Jong-ho
    • Journal of Internet Computing and Services
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    • v.20 no.1
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    • pp.47-55
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    • 2019
  • Free-viewpoint video (FVV) service provides multi viewpoints of contents and synthesizes intermediate video files which are not captured on some view angles so that enables users to watch as they choose wherever they want. Synthesizing video is necessary technique to provide FVV video service, because every video of the FVV contents for different view angles cannot be stored to the content server physically. For the reason, fast view synthesis can improve the quality of video service and increase user's satisfaction. One of the studies for FVV service, a method was proposed to transmit FVV service based on DASH (Dynamic Adaptive Streaming over HTTP). There is big advantage on using DASH that it is commonly used to transport video service. However, the method was only a conceptual proposal, so it is difficult to implement the system using the proposal. In this paper, we propose an implementation method to provide real-time FVV service smoothly. We suggest a system structure and operation method on the server and client side in detail, which is to be applicable to synthesize video quickly. Also, we suggest generating FVV service map additionally which controls a FVV service overall. We manage real-time information of the whole service through the service map. The service can be controlled by reducing the possible delay from network situation.

A Proposal for Zoom-in/out View Streaming based on Object Information of Free Viewpoint Video

  • Seo, Minjae;Paik, Jong-Ho;Park, Gooman
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.16 no.3
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    • pp.929-946
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    • 2022
  • Free viewpoint video (FVV) service is an immersive media service that allows a user to watch it from a desired location or viewpoint. It is composed of various forms according to the direction of the viewpoint of the provided video, and includes zoom in/out in the service. As consumers' demand for active watching is increasing, the importance of FVV services is expected to grow gradually. However, additional considerations are needed to seamlessly stream FVV service. FVV includes a plurality of videos, video changes may occur frequently due to movement of the viewpoint. Frequent occurrence of video switching or re-request another video can cause service delay and it also can lower user's quality of service (QoS). In this case, we assumed that if a video showing an object that the user wants to watch is selected and provided, it is highly likely to meet the needs of the viewer. In particular, it is important to provide an object-oriented FVV service when zooming in. When video zooming in in the usual way, it cannot be guaranteed to zoom in around the object. Zoom function does not consider about video viewing. It only considers the viewing screen size and it crop the video view as fixed screen location. To solve this problem, we propose a zoom in/out method of object-centered dynamic adaptive streaming of FVV in this paper. Through the method proposed in this paper, users can enjoy the optimal video service because they are provided with the desired object-based video.

Layered Depth Image Representation And H.264 Encoding of Multi-view video For Free viewpoint TV (자유시점 TV를 위한 다시점 비디오의 계층적 깊이 영상 표현과 H.264 부호화)

  • Shin, Jong Hong
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.7 no.2
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    • pp.91-100
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    • 2011
  • Free viewpoint TV can provide multi-angle view point images for viewer needs. In the real world, But all angle view point images can not be captured by camera. Only a few any angle view point images are captured by each camera. Group of the captured images is called multi-view image. Therefore free viewpoint TV wants to production of virtual sub angle view point images form captured any angle view point images. Interpolation methods are known of this problem general solution. To product interpolated view point image of correct angle need to depth image of multi-view image. Unfortunately, multi-view video including depth image is necessary to develop a new compression encoding technique for storage and transmission because of a huge amount of data. Layered depth image is an efficient representation method of multi-view video data. This method makes a data structure that is synthesis of multi-view color and depth image. This paper proposed enhanced compression method using layered depth image representation and H.264/AVC video coding technology. In experimental results, confirmed high compression performance and good quality reconstructed image.

Stereoscopic Free-viewpoint Tour-Into-Picture Generation from a Single Image (단안 영상의 입체 자유시점 Tour-Into-Picture)

  • Kim, Je-Dong;Lee, Kwang-Hoon;Kim, Man-Bae
    • Journal of Broadcast Engineering
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    • v.15 no.2
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    • pp.163-172
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    • 2010
  • The free viewpoint video delivers an active contents where users can see the images rendered from the viewpoints chosen by them. Its applications are found in broad areas, especially museum tour, entertainment and so forth. As a new free-viewpoint application, this paper presents a stereoscopic free-viewpoint TIP (Tour Into Picture) where users can navigate the inside of a single image controlling a virtual camera and utilizing depth data. Unlike conventional TIP methods providing 2D image or video, our proposed method can provide users with 3D stereoscopic and free-viewpoint contents. Navigating a picture with stereoscopic viewing can deliver more realistic and immersive perception. The method uses semi-automatic processing to make foreground mask, background image, and depth map. The second step is to navigate the single picture and to obtain rendered images by perspective projection. For the free-viewpoint viewing, a virtual camera whose operations include translation, rotation, look-around, and zooming is operated. In experiments, the proposed method was tested eth 'Danopungjun' that is one of famous paintings made in Chosun Dynasty. The free-viewpoint software is developed based on MFC Visual C++ and OpenGL libraries.

Transmitting Devices Selection Based on Viewpoint Popularity for Wireless Free-Viewpoint Video Streaming (무선 자유시점 비디오 스트리밍에서 인기도 기반 전송 기기 선택 기법)

  • Koo, Jae-Woo;Cho, Young-Jong;Kang, Kyungran
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.5
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    • pp.546-554
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    • 2016
  • Free-viewpoint video (FVV) is a synthesization technology that generates a virtual viewpoint video using multiple videos recorded via wireless devices at heterogeneous locations. In order to introduce a new service that grafts the FVV onto the real-time streaming service using wireless devices, we need to overcome several constraints. Two main factors of those constraints are the limited wireless capacity that are shared fairly by multiple devices, and the transmission time constraint with which live streaming services have to comply. Therefore, for optimal quality of entire videos, a set of transmitting devices should be effectively selected depending on the condition of wireless channel and the required video popularity of specific viewpoint requested from users. For optimal selection, this study proposes a heuristic algorithm that takes into account the aforementioned factors from possible wireless transmission error behaviors and the requested viewpoint popularity. Through analysis and simulation, we show that with this algorithm, quality of most popular viewpoint videos is guaranteed. Furthermore, performance comparison against the existing scheme which is based only on the location of recording devices is made.

Implementation of Integrated Player System based on Free-Viewpoint Video Service according to User Selection (사용자 선택에 따른 자유 시점 비디오 서비스 기반의 통합 플레이어 시스템 구현)

  • Yang, Ji-hee;Song, Min-ki;Park, Gooman
    • Journal of Broadcast Engineering
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    • v.25 no.2
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    • pp.265-274
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    • 2020
  • Free-viewpoint video service is a technology that allows users to watch at any angle, location and distance through interaction. In this paper, the free-viewpoint video services are defined in four viewing modes: Inward view, outward view, 3D object view and first person view. And we developed and implemented a new integrated program that plays all the suggested views. In the contents of girl band performances and basketball games, multi-view cameras suitable for each viewing mode are installed to acquire media, and data stored on the server is streamed over the network, making it available for viewing. Users can freely choose four viewing modes, space location, angle and so on, and the media data such as images and sounds are provided to them by rendering appropriately for the selected the viewpoint. Our system is expected to be a scalable free-viewpoint video service player as well as provide users with immersion and presence by combining various viewing modes.

Modified Ray-space Interpolation for Free Viewpoint Video System (Free Viewpoint 비디오 시스템을 위한 Ray-space 보간 기법 보완 연구)

  • Seo, Kang-Uk;Kim, Dong-Wook;Kim, Hwa-Sung;Yoo, Ji-Sang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2006.11a
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    • pp.41-43
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    • 2006
  • FTV (Free Viewpoint TV, 자유시점 TV)는 사용자들이 원하는 시점을 자유자재로 결정할 수 있는 차세대 TV이다. 또한 영상 획득 시 카메라가 위치하지 않은 새로운 시점을 만들 수 있다. 따라서 FTV는 개인, 산업, 사회, 의학. 사회 분야의 유망한 응용이 될 수 있다. Ray-space에 의한 데이터 표현은 FTV를 위한 데이터 포맷의 한 후보가 될 수 있으며, 실시간으로 임의시점의 영상을 구성하는 데에 있어서 우수한 장점을 가지고 있다. Ray-space에서 사용하는 기법은 컴퓨터 그래픽스가 아니라 순수한 신호 처리 방식이다. 스케일러블 구조, 계층적 구조가 Ray-space로 표현 가능하므로, Ray-space는 비디오 처리의 새로운 플랫폼을 구성할 수 있고 비디오의 개념을 확장할 수 있다. 본 논문에서는 Ray-space 데이터를 이용하여 임의 시점 영상을 생성하기 위해 기존의 보간(interpolation) 기법을 보완한 새로운 기법을 제안함으로써, 보다 자연스러운 영상을 얻고자 하는데 목적이 있다.

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Generation and Coding of Layered Depth Images for Multi-view Video Representation with Depth Information (깊이정보를 포함한 다시점 비디오로부터 계층적 깊이영상 생성 및 부호화 기법)

  • Yoon, Seung-Uk;Lee, Eun-Kyung;Kim, Sung-Yeol;Ho, Yo-Sung;Yun, Kug-Jin;Kim, Dae-Hee;Hur, Nam-Ho;Lee, Soo-In
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.375-378
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    • 2005
  • The multi-view video is a collection of multiple videos capturing the same scene at different viewpoints. The multi-view video can be used in various applications, including free viewpoint TV and three-dimensional TV. Since the data size of the multi-view video linearly increases as the number of cameras, it is necessary to compress multi-view video data for efficient storage and transmission. The multi-view video can be coded using the concept of the layered depth image (LDI). In this paper, we describe a procedure to generate LDI from the natural multi-view video and present a method to encode multi-view video using the concept of LDI.

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Comparative Interactivity Analysis in Multiview Video Coding Schemes

  • Yang, You;Dai, Qionghai;Jiang, Gangyi;Ho, Yo-Sung
    • ETRI Journal
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    • v.32 no.4
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    • pp.566-576
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    • 2010
  • In a multiview video system, interactivity is important for users and should be considered in the design of multiview video coding (MVC). In this paper, we present an interactivity evaluation model for MVC schemes by using both weighted random graph and Markov approaches. The main factors that affect both the interactivity and rate-distortion (RD) performances of MVC schemes are analyzed and discussed in detail. By taking these factors into consideration, a new MVC scheme is proposed for high interactivity and RD gains. Experimental results show that the proposed scheme has a significant interactivity gain with little coding loss, compared to the state-of-the-art benchmark. As an extension to RD performance analysis, the interactivity evaluation model can be used as a design tool of alternative schemes for a future interactive multiview video system.

Fractal Depth Map Sequence Coding Algorithm with Motion-vector-field-based Motion Estimation

  • Zhu, Shiping;Zhao, Dongyu
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.1
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    • pp.242-259
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    • 2015
  • Three-dimensional video coding is one of the main challenges restricting the widespread applications of 3D video and free viewpoint video. In this paper, a novel fractal coding algorithm with motion-vector-field-based motion estimation for depth map sequence is proposed. We firstly add pre-search restriction to rule the improper domain blocks out of the matching search process so that the number of blocks involved in the search process can be restricted to a smaller size. Some improvements for motion estimation including initial search point prediction, threshold transition condition and early termination condition are made based on the feature of fractal coding. The motion-vector-field-based adaptive hexagon search algorithm on the basis of center-biased distribution characteristics of depth motion vector is proposed to accelerate the search. Experimental results show that the proposed algorithm can reach optimum levels of quality and save the coding time. The PSNR of synthesized view is increased by 0.56 dB with 36.97% bit rate decrease on average compared with H.264 Full Search. And the depth encoding time is saved by up to 66.47%. Moreover, the proposed fractal depth map sequence codec outperforms the recent alternative codecs by improving the H.264/AVC, especially in much bitrate saving and encoding time reduction.